Magnetic Performance of (Nd,Ce)-Fe-B-type Die-upset Hybrid Magnet Composed of Melt-spun and HDDR-treated Materials

Abstract

Ce-containing (Nd,Ce)-Fe-B-type hybrid magnet was fabricated by die-upset technique using two different types of materials: Ce-substituted (NdSUB0.55/SUBCeSUB0.45/SUB)SUB15/SUBFeSUB72.2/SUBCoSUB6.6/SUBGaSUB0.6/SUBBSUB5.6/SUB HDDR powder and melt-spun Nd1SUB3.6/SUBFeSUB73.6/SUBCoSUB6.6/SUBGaSUB0.6/SUBBSUB5.6/SUB flakes. Magnetic performance of the hybrid magnet was superior to that of the single alloy magnet when they had identical overall composition: SUBi/SUBHSUBc/SUB = 6.8 kOe, Mr = 10.6 kG, and (BH)SUBmax/SUB = 19.8 MGOe for the Ce-containing hybrid magnet and iHc = 3.9 kOe, Mr = 9.8 kG, and (BH)SUBmax/SUB = 11.6 MGOe for the magnet from the single alloy HDDR powder. Die-upset hybrid magnet consisting of two constituent materials showed smooth and single-material-like demagnetization behavior, and this was attributed to the exchange interaction between neighbouring grains in the magnet.